The 13 should be 31... then
1+1+1=3
1+1+3=5
1+3+5=9...
The next number in the sequence is 27.
33
17?
These are all prime numbers. The next one is 17
17
13
If you eliminate the first number, the rest are prime and the next one would be 29.
From the pattern (n + 4, n + 2, n + ?) I would say the next following number is 20 (n + 1).
8
The next number in the sequence is 27.
-13
17
17 cause it is the next prime number
minus 1, minus 2, minus 3, minus 4, minus 5... The next number is 6.
Actually the next number in the sequence is 17 A 19 , 23 , 29 , 31 ,.......... Prim number
27
35